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Cells (Organelles (Microtubules (cylindrical structures that are hollow…

- - - - receive chemical messages (receptors)
      - allows substances to enter/leave the cell (transporters)
    - - barrier
  - - - removes organelles from cytoplasm
      - fluid part of cytoplasm
  - - - instructions for cell functions
- - - - no cellular energy used
    - - sometimes through a barrier
    - - ex: O2 & CO2
- - - - your own worn out cells, bacteria, & viruses (pathogens)